AMD MI455X
vs
Nvidia H800
The MI455X is newer, with 5.4x the memory and 12x the bandwidth.
At a glance
Memory
5.4x more on MI455X
- MI455X
- 432 GB
- H800
- 80 GB
Memory bandwidth
12x higher on MI455X
- MI455X
- 23.30 TB/s
- H800
- 2.00 TB/s
Cheapest on-demand
MI455X is not sold on demand
- MI455X
- --
- H800
- --
Price comparison
Median price per GPU per hour by billing type, with the cheapest listing under it.
Specs comparison
| Spec | MI455X | H800 | Difference |
|---|---|---|---|
| Memory | |||
| Capacity | 432 GB HBM4 | 80 GB HBM2e | 5.4x more on MI455X |
| Bandwidth | 23,300 GB/s | 2,000 GB/s | 12x higher on MI455X |
| Bus width | 5,120-bit | ||
| Compute · dense | |||
| FP4 | 40,265 TFLOPS | Not supported | MI455X only |
| FP8 | 20,133 TFLOPS | 1,513 TFLOPS | 13x higher on MI455X |
| FP16 / BF16 | 5,033 TFLOPS | 756.5 TFLOPS | 6.7x higher on MI455X |
| INT8 | 5,033 TOPS | 1,513 TOPS | 3.3x higher on MI455X |
| FP32 | 315 TFLOPS | 51 TFLOPS | 6.2x higher on MI455X |
| Platform | |||
| Interconnect | Infinity Fabric 3,600 GB/s | NVLink 400 GB/s | 9x higher on MI455X |
| Released | Q3 2026 | Q1 2023 | 3 years newer on MI455X |
| Precision | |||
| Supported formats | FP4FP6FP8FP16BF16FP32INT8 | FP8FP16BF16TF32FP32FP64INT8 | |
Compute: Vendor peak figures, dense and per GPU. Not measured throughput.
Source: MI455X datasheet .
Where to rent them
Providers that rent these GPUs, with each one's cheapest rate. No provider we track offers both right now.
| Provider | MI455X | H800 |
|---|---|---|
Azure
USA
|
On request Custom | -- |
Cirrascale
USA
|
On request Custom | -- |
Oracle Cloud
USA
|
On request Custom | -- |
TensorWave
USA
|
On request Custom | -- |
Vultr
USA
|
On request Custom | -- |
Similar GPUs
Other comparisons in the same class.
-
Nvidia B300
288 GB HBM3e · 66% less bandwidth than the MI455X
From $4.99 /GPU/hr Compare
-
AMD MI355X
288 GB HBM3e · 66% less bandwidth than the MI455X
From $5.99 /GPU/hr Compare
-
Nvidia GB300
288 GB HBM3e · 66% less bandwidth than the MI455X
From $18.00 /GPU/hr Compare
-
Nvidia H100
80 GB HBM3 · 68% more bandwidth than the H800
From $1.30 /GPU/hr Compare
-
Nvidia H200
141 GB HBM3e · 2.4x the bandwidth of the H800
From $2.09 /GPU/hr Compare
Our data for AMD MI455X was last updated on Sept. 14, 2026, and for Nvidia H800 on Sept. 14, 2026.